Date: Wed, 1 Apr 2015 16:37:21 -0700 From: Mark Millard <markmi@dsl-only.net> To: Warner Losh <imp@bsdimp.com> Cc: FreeBSD Toolchain <freebsd-toolchain@freebsd.org>, FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: Re: Shorter report: powerpc64-xtoolchain-gcc use fails from powerpc (non-64) Message-ID: <7AF12D5F-F4A0-429E-AEAE-4AEF2D35FE31@dsl-only.net> In-Reply-To: <B49E8B91-B8C2-4F0C-9662-8814C16041A4@bsdimp.com> References: <BB07709E-A5D3-458A-8ED7-61E64103A43C@dsl-only.net> <B49E8B91-B8C2-4F0C-9662-8814C16041A4@bsdimp.com>
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On 2015-Apr-1, at 02:49 PM, Warner Losh <imp at bsdimp.com> wrote:
>> On Apr 1, 2015, at 2:44 PM, Mark Millard <markmi@dsl-only.net> wrote:
>>=20
>> Attempting to use CROSS_TOOLCHAIN=3Dpowerpc64-gcc on powerpc (non-64) =
11.0-CURRENT with TARGET_ARCH=3Dpowerpc64 gets:
>>=20
>>> --- crti.o ---
>>> gcc -O2 -pipe -I/usr/srcC/lib/csu/powerpc64/../common =
-I/usr/srcC/lib/csu/powerpc64/../../libc/include -mlongcall -std=3Dgnu99 =
-Wsystem-headers -Wall -Wno-format-y2k -W -Wno-unused-parameter =
-Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wreturn-type =
-Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wunused-parameter =
-Wcast-align -Wchar-subscripts -Winline -Wnested-externs =
-Wredundant-decls -Wold-style-definition -Wno-pointer-sign -c =
/usr/srcC/lib/csu/powerpc64/crti.S
>>> ...
>>> /usr/srcC/lib/csu/powerpc64/crti.S: Assembler messages:
>>> /usr/srcC/lib/csu/powerpc64/crti.S:35: Error: junk at end of line, =
first unrecognized character is `@'
>>> /usr/srcC/lib/csu/powerpc64/crti.S:51: Error: junk at end of line, =
first unrecognized character is `@'
>>> *** [crti.o] Error code 1
>>>=20
>>=20
>>=20
>>=20
>> Read below only for analysis.
>>=20
>>=20
>>=20
>> First I'll deal with the error messages. Then I'll deal with the =
"gcc".
>>=20
>> The lines of crti.S in question are:
>>=20
>>> .quad .L._init,.TOC.@tocbase,0
>>> ...
>>> .quad .L._fini,.TOC.@tocbase,0
>>=20
>> The error messages are because __powerpc64__ is not defined when =
machine/asm.h is included so the wrong definition is used for =
_ENTRY(=E2=80=A6):
>=20
> The gcc port needs to be fixed, with changes fed upstream.
The head/lib/csu/powerpc64/Makefile generated "gcc" as the command (see =
above). That in turn ended up as using: /usr/bin/gcc , which is the =
FreeBSD 4.2.1 system gcc.
So no port was involved. That may be the (or a) problem: ${XCC} was not =
being used.
>>> #ifdef __powerpc64__
>>> ...
>>> #define _ENTRY(name) \
>>> .section ".text"; \
>>> .p2align 2; \
>>> .globl name; \
>>> .section ".opd","aw"; \
>>> .p2align 3; \
>>> name: \
>>> .quad DOT_LABEL(name),.TOC.@tocbase,0; \
>>> .previous; \
>>> .p2align 4; \
>>> TYPE_ENTRY(name) \
>>> DOT_LABEL(name):
>>> ...
>>> #else /* !__powerpc64__ */
>>> #define _ENTRY(name) \
>>> .text; \
>>> .p2align 4; \
>>> .globl name; \
>>> .type name,@function; \
>>> name:
>>> #define _END(name)
>>> #endif /* __powerpc64__ */
>>=20
>> The (powerpc64 specific) Makefile may need to force a 64-bit usage =
(-m64 ?), presuming that such is supported from the 32 bit environment.
>=20
> Generally, we=E2=80=99ve not added those kinds of flags to the command =
line. There=E2=80=99s many subtle issues in the tree trying to do =
that=E2=80=A6
>=20
> Warner
=46rom a powerpc (non-64) 11.0-CURRENT boot is the following supposed to =
work by producing a powerpc64 appropriate result (no CROSS_TOOLCHAIN for =
this question)?=20
make buildworld buildkernel KERNCONF=3DGENERIC64 TARGET=3Dpowerpc =
TARGET_ARCH=3Dpowerpc64
The standard v4.2.1 /usr/bin/gcc in a powerpc context (non-64) for that =
make command would produce files for TARGET_ARCH=3Dpowerpc unless the =
command lines specified otherwise.
Notably the build environment is picking powerpc64 specific paths when =
appropriate, such as:
lib/csu/powerpc64/Makefile
so that specific Makefile is not likely to be used when powerpc64 =
handling is inappropriate, even executed from from a powerpc (non-64) =
context. A different path (and so a distinct Makefile) would be used for =
KERNCONF=3DGENERIC TARGET_ARCH=3Dpowerpc .
=3D=3D=3D
Mark Millard
markmi at dsl-only.net
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